Combined bell and buzzer.



OSCAR H. STUEWE AND LOUIS 1W. JANSEN, OF MILWAUKEE, WISCONSIN.

COMBINED BELL AND BUZZER.

Application filed February 11, 1915.

To all whom it may concern:

Be it known that we, OsoAn H. STUEW and Louis M. J ANsEN, citizens of the United States, and residents of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Combined Bells and Buzzers, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to improvements in combined bells and buzzers.

It is the ordinary practice .in the use of electric bells and buzzers to mount the bells and buzzers upon separate bases or supports and consequently the different instruments have to be independently installed. Also in installing the different instruments independently a greater number of wires are required to complete the different circuits. This arrangement is unnecessarily expensive in the requirement of a plurality of parts and the installing of the separate devices.

It is one of the objects of the present invention to overcome the before mentioned objectionable features and provide a combined bell and buzzer mounted upon one base and being so constructed as to eliminate the use of unnecessary wiring and parts.

A further object of the invention is to In the accompanying drawing in which the same reference characters indicate the same parts in all of the views: Figure 1 is a top view of the improved combined bell and buzzer, the casing being shown in section; Fig. 2 is a transverse sectional View thereof taken on line 2-2 of Fig. 1.

Referring to the drawing the numeral -5 indicates the base of the improved combined bell and buzzer and upon which base the parts are mounted. The base is formed of sheet metal and is provided with ears 6, 7, 8 and 9 which have been cut from the base and bent upwardly. One end of the base is Specification of Letters Patent.

Patented Dec. '7, 1915.

Serial No. 7,590.

magnets 12 and 13 which project in oppo-- site directions from each other. The magnet 13 projects toward the side of the frame having the ear 9 and is the magnet controlling the rmging of the bell 11. An armature 14 is pivotally connected to the ear 9 extends transversely of the ends of the cores 12' and 13 of said magnets and at its free end is provided with an extending rod 15 having a. hammer 16 mounted on its end which engages the bell. The armature 14 is also provided with a spring contact 17 adapted at one end to engage the fixed contact '18 mounted on and insulated from the base 5 by the insulating plate 19. The opposite end 17 of the spring contact is bent at right angles and bears against a projection of the ear 9 and serves to normally hold the armature 14 away from the magnets and the spring contact 17 in engagement with the fixed contact 18.

'A binding post 21 insulated from the base 5 is connected to the convolutions'22 of the magnet 13 by a Wire 23, and a wire 24 connects the opposite end of the Wire of the convolutions to the fixed contact 18.

The spring contact 17 and the armature 15 are grounded on the base 5 and a medial binding post 25 mounted on said base is also grounded thereon. The binding posts 21 and 25 are included in a circuit 26 which also includes the battery 27 and a push button or switch 28 so that when the switch is closed the magnet will be energized and the flux will flow through the cores of both magnets and the buzzer armature 29 and attract the bell armature and cause it to vibrate and ring the bell in the ordinary manner..

The armature 29 is pivoted at one end to the upstanding ear 8 and is also provided with a spring contact 30 which engages the fixed contact 31 mounted on and insulated from the base 5 by the insulating .plate 32. The opposite end 30 of the spring contact is bent at right angles and bears against a projection of the ear 8 and serves to normally hold the armature 29 away from the magnets, and the spring contact 30 in engagement with the fixed contact 31.

A binding post 36 insulated from the base 5 is connected to the con-volutions 33 of the magnet 12 by a wire 34, and a wire 35 conloo nected to the opposite end of the wire of the convolutions to the fixed contact 31. The spring contact and the armature 29 are grounded on the base Said binding post 36 is also connected'to the battery 27 by a wire 37. This buzzer circuit also includes the battery, the ground binding post 25 and the base 5. A pusl. "utton or switch 38 controls the current to the buzzer magnet and the vibrations thereof. The flux generated by the energization of the buzzer magnet passes through the bell armature and magnet core and attracts the buzzer armature and causes it to vibrate in the ordinary manner.

It will be observed that the armatures project in opposite directions and across both of the poles of the magnets, so that, when either one of the magnets is energized, it operates only the arn'iature which is pivoted farthest therefrom, the remaining armature not being attracted owing to the short leverage. Thus when the magnet 13 is energized, the magnetic flux will flow toward both ends of the core 13, and at the end adjacent the armature 29, instead of attracting the armature, which it will not' do owing to the short leverage, it will jump the narrow space, flow through the armature 29, and jump again to the core 12', when it will flow toward the armature 15 and help the magnetism in core 13 to operate said armature 15.

Themagnetic lines of force in passing from the energized magnet to the other magnet, is greatly lessened by the leakage at the air gaps in the circuit, thus the magnetic force in the core which has the unenergized winding is not strong enough to attract armature 29, but will reinforce or cooperate with the power in core 13 to operate the armature 15.

The numeral 39 indicates a cap or cover which is connected to the base 5 by lips 40 projecting from the base.

From the foregoing description it will be seen that the invention eliminates the use of separate devices and provides a single device where heretofore two-separate devices have been used.

It will be further seen that the combined bell and buzzer is of very simple construction and is well adapted for" the purpose described.

lVhat we claim as our invention is:

A combined bell and buzzer, comprising a base, a pair of independent electro-magnets mounted on said base in alinement with each other and having both ends of their cores exposed, electric connections for energizing each of said magnets separately, a pair. of armatures mounted on said base independently of the magnet mountings and projecting in opposite directions to each other and transversely of the ends of the cores of both magnets leaving a clearance therebetween. fixed contact points on said base and insulated therefrom, and springs fixed to said armatures in normal engagementwith their respective contacts.

In testimony whereof, we aflix our signatures, in presence of two witnesses.

OSCAR H. STUEWE. LOUIS M. JANSEN.

Witnesses:

A. C. ROSSBACII, C. H. KEENEY. 

